Which of the following compound does not have hydrogen bonding :

Options

A. `K_(2)HPO_(4)`
B. `K_(2)HPO_(3)`
C. `NaHCO_(3)(s)`
D. `CH_(3)-underset(" "O-H)underset(|)(C)=CH-overset(O)overset(||)C-CH_(3)`

Answer

To determine which of the following compounds does not have hydrogen bonding, we need to analyze each compound based on the presence of hydrogen bonding capabilities. Hydrogen bonding typically occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (like oxygen, nitrogen, or fluorine) and is attracted to another electronegative atom.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds given in the question are:
- a) K2HPO4
- b) K2HPO3
- c) NaHCO3
- d) CH3COH (which is likely meant to be CH3CHO, acetaldehyde)

2. **Analyze K2HPO4**:
- K2HPO4 contains the phosphate ion (HPO4^2-), which has an -OH group. The hydrogen atom in the -OH group can form hydrogen bonds with oxygen atoms in other molecules. Thus, K2HPO4 can exhibit hydrogen bonding.

3. **Analyze K2HPO3**:
- K2HPO3 contains the phosphite ion (HPO3^2-), which also has an -OH group. Similar to K2HPO4, the hydrogen atom in the -OH group can form hydrogen bonds. Therefore, K2HPO3 can also exhibit hydrogen bonding.

4. **Analyze NaHCO3**:
- NaHCO3 is sodium bicarbonate, which is an ionic compound. It dissociates into Na^+ and HCO3^- ions in solution. There are no covalent bonds involving hydrogen with electronegative atoms in this compound, so it does not exhibit hydrogen bonding.

5. **Analyze CH3CHO**:
- CH3CHO (acetaldehyde) has a carbonyl group (C=O) and a hydrogen atom attached to a carbon atom. The hydrogen can interact with the oxygen of another acetaldehyde molecule, allowing for hydrogen bonding to occur.

6. **Conclusion**:
- Among the given compounds, NaHCO3 does not have hydrogen bonding due to its ionic nature.

### Final Answer:
**NaHCO3 does not have hydrogen bonding.**

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